xamarin.forms-3.3.0.Label-text-decorations.xaml

<Label>
    <Label.FormattedText>
        <FormattedString>
            <FormattedString.Spans>
                 <Span Text="Lorem ipsum " FontAttributes="Bold" TextColor="Blue" TextDecorations="Underline">
                    <Span.GestureRecognizers>
                        <TapGestureRecognizer  Command="{Binding TapCommand, Mode=OneWay}"
                                           CommandParameter="https://luismts.com/"/>
                    </Span.GestureRecognizers>
                </Span>
                <Span Text="dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua." />
            </FormattedString.Spans>
        </FormattedString>
    </Label.FormattedText>
</Label>